One of the items I cannot do without in my makeup box is my Foundation Primer. I absolutely love this item as it does for your skin what lingerie does for your figure -it smoothes, flatters, conceals and hold things in place, so that everything you put on top of it looks immediately better.Primers create a layer between your makeup and your skin to protect your skin.It smoothes out your skin, so the makeup goes on smoother thereby making the makeup last longer. Primers minimise the appearance of pores and evens skin tone, primers do this whilst creating a velvety base for make-up and helping it to stay put for longer. My favourites are smashbox primer, blackup primer, laura mercier primer and my latest addition,the arbonne primer. They have served my clients and I really well by helping to create an excellent canvas for the makeup to glide on. Please share your best makeup primers with us.